Not. What is needed is a completely and economically re-usable earth-to-LEO SYSTEM (i.e. the ORIGINAL space shuttle design concept, with both booster AND orbiter fully recoverable). The current space shuttle was and is a kludge forced on NASA by budget cuts forced on the space program by the "welfare Democrats".
What should be done now is focus on the NEXT-GENERATION fully recoverable earth-to-LEO system, built using today's technology--not a retreat to 1960's technology.
SSTO sounds really awesome at first. But I am skeptical of their possibility, at least in the way it was presented by venturestar. Delta-V is an important measure of a rocket's performance. By plugging in numbers from this link, to this link, it can be deduced that x-33 is a flop in theory. You should find that x-33 is lacking over 1000 seconds of Isp to even be possible. Sadly, no chemical engine exists (theoretical or actual) that could do what nasa wanted x-33 to do. The only known way to acomplish SSTO with large payloads is with a thermal atomic engine like NERVA (but better and more powerful of course).
BTW, x-33's engines were rated at 450 Isp.. quite nominal for a LOX LOH engine.
