Google can't really pick and choose. They can't, but I won't cooperate until they have the full suite of apps. Google Voice, YouTube, Hangouts, Talk, Gmail. Google was fine developing a Google search app because it generates money for them. Gmail and the other apps, on the other hand, they got it already on their servers so developing an App won't help.
I can't say that it's easy to not use Google's products, it's very hard and I haven't been very successful. Microsoft has failed to develop replacement apps that wow people to use their services instead. Where's the Google Voice replacement? Even Skype hasn't improved a tiny bit since it was acquired? Outlook got better, but still has more room to go to catch up to Gmail.
If they develop a better browser for Windows Phone than IE, I will use it after they have a Google Voice and YouTube App.