IIRC, they've been "reportedly doing just that" for well over a year.
Only if you make them tough. There's no good reason not to support both flash and HTML5 now, then wean yourself off of one in favor of the other later. All the "buggy" and "battery eating" problems can and should be end-user decisions. If I'm sitting in my car with a cigarette lighter cord powering the device, or in an airport plugged into AC, "battery life" is no longer an issue. If the phone is at 20% battery life and external power is no where to be found, I guess I won't be using flash, (or WiFi, or heavy data sessions, or anything else that will squander my battery power.)
When Apple stopped including 3.5" floppies, which was very forward thinking, how did Mac users benefit, other than having the bragging rights of being first to ditch old tech? 3.5 internal drives cost under $10 wholesale at the time, and I personally still had a box of 3.5" disks on my computer table. The transition to a floppyless world wasn't tough for me at all- my PCs had one until AFTER they were obsolete, rather than before! Someday, decades from now, when we control our PCs by sheer power of thought alone, we won't need keyboards or mice, either. Are you ready to ditch yours today in anticipation? ;)