You can still go all-in. Just beware that Microsoft is looking to the future. An Xbox is as solid as an investment as you can make, considering its a console. A Surface is a solid buy as is subscribing to Office 365. Office is part of their core business.
I read recently comments, however, that Microsoft may be exploring how to put game processing up in the cloud thereby allowing anyone access to their games via thin clients (like browsers and tablets). If this comes to pass, that could mean the end of Xbox (at some point). Will it end with this generation? Highly doubtful. Sony bought
-OnLive- that did the same thing. I tested it before Sony bought them, and it worked surprisingly well. I played Darksiders 2 on a web browser while at work. Again, surprisingly well. Still, all Sony has done since has sat on it. They didn't want to bring about the death of console hardware, yet. They aren't ready for that. Microsoft... may be.
Having said that, the OP/OQ is about whether or not I'm miffed about Groove shutting down. The answer is YES. I switched to an iPhone as soon as Microsoft did another pivot. I'm okay with the pivots. I want Microsoft to survive and accept their business decisions towards that end. But, I was a long time Windows Phone user dating back to the first Windows Phone 7 device, Samsung Focus. I participated in all of their beta stuff, all of the iterations, on many many devices. But I was ready to let them do them. In switching to the iPhone I felt like a *****. But, Microsoft made it easier for me to switch. I had all of the apps I enjoyed on Windows Mobile right on iOS. Some of them work a little better. Groove was among the apps/ services I really enjoyed. Mostly because of my personal library uploaded to OneDrive. It was a great innovation that worked well for me. Now comes Groove's exit and I was panicking. I've since took Microsoft up on Spotify and I have to say that, while it took a while to explore its layout and features, I am digging it more and more. I love the integration re: remote music outputs such as Sonos, wifi speakers, consoles, etc. I love that my playlists and collection (matched songs anyway) were migrated successfully. Overall, I think I'm going to be happy with the service that millions adopt. Plus, music is Spotify's CORE business. They can do them and we can know that our needs will be their focus.
Microsoft has done some great things over the years. I'll always be a fan and a user as long as it makes sense to be. From the early days of hardware (Sidewinder, keyboards, and mice) to the now (Surfaces, keyboards, mice, hololens, etc). I personally own a Surface Pro 3, Surface Pro 4, several Windows 10 gaming PCs (Alienware Aurora/ 18/ X51), Xbox One, and soon and Xbox One X.
Honestly, with their refocusing at play, I kind of wish they would do something about Xbox Video. We know now they want to get out of media. It is too much for them to compete on so many different fronts and to do it well. They should work out a deal with Vudu, for instance, and allow us Xbox Video adopters a way out. They didn't have to work something out for Groove users, but they did.
I am not making excuses for Microsoft, but I am accepting their excuses. I understand them. I'm not giving up. I'm just more on stand-by watching what they do next.
If I had to speculate about anything, I'd say that the reason they didn't release a Surface "mini" is because that might distract from the rumored Surface "mobile" device. i.e. The Surface "mini" might actually compete against a smaller form factor tablet with telephony support and confuse customers. Perhaps, in the same manner that the Surface Laptop confused Surface users. I mean, didn't Microsoft say Surface was the tablet that could replace your laptop? Why make a laptop!? Hehe.
Anyhow, I say go for it. I have been thinking a lot about this because I've been wondering the same thing. Forgive me for my rambling dribble.