Sadly I think this team will never win a championship, no matter how deep this cleanup goes. I'd be fine with a Hawks-like scenario where we would at least get to the playoffs for 5 years and maybe even reach the conference finals. That would be a great start and right now we can't ask for anything more imho.
For every success story like f.e. the Thunder, there are also rebuilding drama's like the Kings, so there are no guarantees. Sucking for too long might even mean the team get's moved to another city...
Plus I don't think I can handle another 5 years of extreme sucking, so I think I'll be a Rockets fan for a while and then check back in after 5 years.