I don't want the 2.6 branch for further releases. It contains tons of bugs. 2.7 has the fixes and is very stable. Working on 2.6 makes no sense. Killing it now saves a lot of time.
You're still being unclear (what bugs? have you reported it? has it been fixed? fixed in what version? it all will be written in your bug report), other than (probably fatal, no idea since I'm still on x86) x64 bugs, everything else is mostly fine. 2.7.X is NOT stable, you're maybe lucky to have a perfectly working revision, but a broken revision update can come anytime. You just haven't faced it (I have, and when it happens, with your current attitude, you might stop using FPC at all).
2.7.X is currently the one where developers are free to add new features or fix HUGE bugs, this is not possible for 2.6.X. Some small features might be backported but fixed bugs are the main concern for patch release (the last digit in FPC versioning). 2.6.X has much lower chance for new bugs to appear than 2.7.X. Please understand the development lifecycle of FPC, don't be selfish (and no guarantee 2.8.X would be bug free anyway).
I can use 2.7.1, but there will be no open source. Currently I need to apply few custom patches anyway
Why don't you send the patches instead?