I think the main problem with these types of threads is a simple matter of perspective.
What did WP need in 2010? A launch, and a few buyers. There were so few apps/tools that I have always looked at it as a "soft start", with MS testing out the Metro UI in the real world. Pretty much succeeded, as the bar was pretty low. They got a ton of press and a bunch of really eye-catching devices launched.
What did WP need in 2011? Succesful updates (NODO, Mango, Tango) and increased awareness. Again, mostly succesful. The Nodo (cut &paste) update was pretty rough, but the Mango update was pretty nice. Unfortunately, the fact WP was being outsold by Win Mobile and that MS was making more money off of Andriod royalties were black eyes.
What did WP beed in 2012? Nokia. Badly. They needed a worldwide partner to hold the WP banner high. Until Nokia took this bull by the horns and force MS to react (forcing the "Tango" adjustments which allowed low end devices, Nokia producing their own apps and being the driving force behind a bunch of games and support coming over), WP was a after thought and a niche market. Nokia kicked things into high gear and made WP respected.
What did WP need last year? WP 8 to be the upgrade worthy of leaving WP 7 behind. And, it was. HTC and Nokia killed it with their lines at launch and the addition of the L1020 turned heads and gave WP and Nokia some outstanding press. MS turned the corner in the world of mobile and finally gained a measure of respect, and the 3 upgrades released during the year along with MS promising a year and a half support for their OS got them in 3rd place and above 10% in a few markets (God Bless you, L520). It was a success and the best year yet.
So, as I ramble, what does WP need in 2014??
-Intergrate Nokia hardware and- way more important-DO NOT LOSE MOMENTUM OR THE NOKIA EMPLOYEES. MS needs those engineers and developers in a bad way.
-Keep the other OEM's and find a way to support thier devices better. HTC, Samsung, Sony, and whatever coalition of the willing they can find. WP is only better off with more creative minds building devices.
-Push ahead to 10% sales worldwide. WP most likely can't get there in 2014, but there is zero excuse not to get close.
-Better enterprise adoption and tools. Vital. Stinking vital. (Pencil this one in for Windows 8 as well.)
-WP 8.1 needs to wow us. We know the hardware will, just based on the L1520. But the update needs to put WP in the same league as Andriod and iOS, even if it is still behind, and needs more unique selling points like thr Rooms and Kids Corner. A little refresh on the Metro UI needs done as well. A lot of reviews and sites are starting to attach "stale" onto the home screen layout. A little pizzaz wouldn't hurt.
Do I think WP can nail all this in 2014? Yep. I think every item listed is realistic. Do they need to beat Apple and Google? No, they do not. More importantly: They plain can't yet. Not a prayer. Too much mind share is given those two OS's. But WP doesn't need to beat them for 2014 to rock for our favorite OS.
2014 could very well be a great year. The year to beat all years. Until 2015, of course....