If you want 10 spd. just get DA 7900 or even Ultegra. I think it's great that Shimano is going all the way and delivering the most cutting edge product available. If you don't like the move to 11spd. better close your eyes when that new DA 4-arm crankset passes by.
Also, I'm sure Shimano wasn't happy with the compatibility with SRAM. Probably cost them more sales than they might lose (debatable either way) with the switch to 11spd. I just bought new wheels with 10spd. hubs so I will probably be on 10spd. for another season or 2. I feel like I still have plenty of options...Plus they're cheaper options now.
I got this off a thread on roadbikereview on the topic SRAM 11spd. Interesting opinion.
"I think the rub is this:
The first designs for Shimano (and presumably SRAM) 11 speed have come out and it seems that 11-speed require completely different rear hubs in order to fit into conventional 130mm dropouts. To me this is non-starter. As nice as an extra intermediary cog would be, its not worth rebuilding 2 rear wheels for, and by the looks of it, there's no way around it.
To me, it makes more sense to wait for 12-speed down the road, and what appears to be the inevitable standardization of 135mm or larger rear dropouts (although I'm curious what that means in terms of chainstay length, foot clearance, Q-factor, etc). At that point, it makes more sense to me to make a big change that might last awhile rather than what appears to be an intermediate change that will be outdated in a year or two. It's going to make frame buying a fairly hazardous activity the next couple of years, I'd wager."