Yes i think the number of 4.x owners is not very big, thats why i hope smealum realese his exploit Soon, i own a 4.x console and a 7.x, i hope that smealum found a way to run the exploit on 7.x
He did say that for it to work on 7.x 'simply' a new entry point has to be found, since Nintendo patched the MSET bug (took them long enough tbh). And the way he said it, made it sound easier (much easier?) than the whole second-stage exploit (which SSSPWN is)
Also a small benefit from it, if the new entry point worked on older firmware's too (from 6.3 down) it would mean that nobody has to 'brick' their DS mode anymore.