JRPG's seem to be selling almost as much as they were the last two generations. There has been a small overall drop but I think that has to do with the Nintendo Wii. The Wii has nearly half the market and very little in the way of quality rpg's. The majority of the quality JRPG's (DS/PSP not included) are on PS3/360 and a fair amount have been released as exclusives or timed-exclusives. So instead of releasing to a mega dominant PS1/PS2 market, they're being released to a more a evenly distributed one. Also, there is simply more competition with all the games that are coming out over various platforms.
FF13 is only 2M or so off 7 and 10, DQ is selling the same and the rest are generally in the 300k - 1M range, close to status quo. I actually think what hurt FF13 the most was the fact it came out relatively late in the generation. If it was released in 2007 or 2008, I think there would have been much more of a buzz around it. For the PS1 and PS2, the first FF game was seen as the benchmark for presentation and production values, something that would set the standard for the rest. With the FF13 coming out in late 2009/early 2010, that was no longer the case.
Also, I think Mass Effect is incredibly boring...just throwing it out there.












