Hahaha, I'd believe it -- I originally picked up SAM at the start and only made it to about 51 before I dropped out of the game for a few years from frustration over the lack of party invitations. I still remember the long days in Jeuno praying I would get to do ANYTHING only to log out 7 hours later with nothing accomplished. It's hard to lose XP when you aren't actively putting yourself in harm's way..
Realistically It would be surprising if we saw any kind of change to the current system until long after everything else has been touched on. As a developer it would be really hard to give players a lenient system only to make a change overnight and say "hey folks, sorry but now you're going to have to start suffering now". The game is already fairly established, so if it ISN'T touched soon, it'll become less and less likely that we'll see any kind of changes down the road.
In the event SP/XP changes weren't even being considered as a penalty, I think I'd prefer a gil sink like gear damage. Lord knows there's enough gil floating around in the economy as it is..