They will not make a new ending, because that would be unfair to the people who liked the ending
Bob, Steve and Jenny will be happy then, I think that pretty-much covers everyone who liked the ending.
What about the remaining 97% of players though?

To be a little more serious... Awakening proved that destroying a relay essentially created a supernova within the system. How can Shepard destroying them using the Star Brat's three possible endings be any different? Are they destroyed using some kind of micro black hole, in which all the released energy is contained and sucked safely into hyperspace or some such?
If that is the case, why the heck wasn't it revealed within the game? It makes no sense! What caused the devs to assume that we would 'just know' that there would be no supernova-type-explosion... when all the evidence we have (Awakening) says otherwise?
I also find it real hard to believe Bioware ran out of money, it's a lot more realistic (to me at least) to believe that they ran out of
time, not cash (i.e. EA up to their usual tricks with impossible-to-meet deadlines).