In many lines there is a long waiting game where white does not wants to to play cxd4 or black does not want to play dxc3 . Soon both sides run out improvents moves. Engines think 0.00 in many position but no forced repetitions.

Thank you kylemeister- very informative. Of course I should have thought of 7.0-0. 

Possibly a silly question, I am getting back to chess after a long break and I might be relying on outdated theory, but:

-wasn't it the case that the above move order was considered inaccurate (with the "correct" line being interpolating 6...cxd4 before Bd7 to avoid the option)   as white can advantageously play 7.dxc5! (as in a much quoted Nimzo-Salwe game)? Has this been defanged somehow? 

-even if it has, wouldn't black want to avoid these new gambit ideas anyway with the 6...cxd4 move order? Then Re1 is not a thing while 7.Nbd2?! Must be a worse version for white as I suspect black can do better than transposing with 7...Bd7 (eg dxc followed by Ne7-g6 comes to mind?)

Thanks for any reply!