Hi Terry;
I must say ... "Very well put"! 
Personally, I have tried this scenario over 5 times in the past many years and seen many others attempt this feat. The outcome for me is PB - 0 and VS - 5 and the same for the few others I have seen attempt this change in IDE argument. Add to your VS list: integrated testing, integrated SCM, integrated SSIS reporting, proper support for SS2012, etc and you pretty much wipe PB out of the game from the VS developer's perspective. Now add proper support for ASP, Windows 8, Windows Mobile .. etc and you would be better off defending yourself against a pack of wild dogs IMHO.At least the chances of survival might be better. :-)
So let me also say ... "you are in an unenviable position: trying to convince Visual Studio lovers not to use Visual Studio"!
Now, can SAP turn things around ... Hmmm - no road-map, no PB 15 (maybe 2014 now), no change in management, maybe no PDC this year, no PB Classic "how to videos", retiring / no longer using PB resources, no support for education from major ED centers like Learning Tree, etc and I doubt whether SAP is in a position to effect any PB change in 2013 .. just my impression FWIW..
Sorry to be so negative! While I am personally super productive in PB - especially adding Appeon Web & Mobile to the mix - this is "hard sell" for VS developers who have grown up into IT through college & university using VS.
Regards ... Chris
PS: Good Luck anyway!