Will continue to use it until projects like Shumway (Mozilla - which runs on HTML5) can run flash without any problems (and has a standalone like flash player projector).
Am I worried about exploits? No... we have tools to circumvent these threats. Adobe releases patches regularly and are doing their best to provide a good experience. HTML5 will succumb to exploits just like any other software. Coding is not a perfect art.
It's still present on my pc. I would like that tommorow there is no flash player anymore, but I need it on certain sites, which aren't updated to html5 yet. Also the video player that is used by my university is still in flash player and many educational sites like the one from pearson still require flash, so it will still take lots of time until I can uninstall it. It has his leaks, but it is patched very often by Adobe, so It's not that it is the most dangerous thing to have on your computer. If you watch out a bit and you have the right tools present on your pc to prevent being infected, there is no need to worry imo.
I have Flash/Java on demand - installed and updated using Qualys browser check once a week, but always set to - ask to activate so that none of them runs without user intervention(only when it is really required),on top of that I am using NoScript which supresses Flash/Java. And an additional layer of MBAE( It does work, it was giving me warnings when I had a buggy add-on installed of ROP attack but problem was gone with the add-on)
If you are wondering how dangerous these plugins can be take a look here : http://krebsonsecurity.com/2016/02/good-riddance-to-oracles-java-plugin/
For youtube I have already saved the HTML5 mode by preserving the cookie, but Flash is required in certain situations( example mass pic uploader in the malware hub/other is single file only)