Not going to happen ever, I help crack games for ReviveDC and Dreamcast Clean Merge Project. DC max resolution is 640x480 and even then if a game wasn't codded to add VGA it will not work and there is no way to force them. I use a VGA to HDMI upscaler to get 1080p from my games but they cost about $100+ for a good one, cheap crappy ones that don't really work are cheaper but you get what you pay for.
PS3 CECH-2501A [CFW] & CECH-3001 [OFW]/ PS2 SCPH-3901 & SCPH-7501/ PS1 SCPH-5501
Mod Cobra 4.46 v7.00 w/ E3 Flasher [CFW] & Cobra ODE 4.50 [OFW]/ Mod HDD-OSD [Phat] & Modbo 4.0 [Slim]/ Mod MM3
HDD 1tb [CFW] & 640gb [OFW]/ HDD 640gb & OPL v0.92 w/ 1.5tb SMB