Rest assured that no one on the right sabotaged the ACA roll-out. They didn't need to.
You asked."why is not so far-fetched to think that as a last resort they may have plotted to keep the system from getting off the ground by making sure that people were not able to sign up"
We did not have to keep people from signing up because the premiums under ACA managed to do that all by themselves.
In fact, no one in their right mind that is healthy and working would willingly choose to sign up for ObamaCare. The only ones signing up are those with no jobs and catastrophic illnesses like lung cancer and AIDS who will not pay a dime out of pocket for their ACA health insurance. Everyone signing up is a worthless deadbeat parasite on society with a catastrophic illness looking to "make the man pay" for their poor choices and stuck on stupid attitude toward life.
At some point, even you will realize that ObamaCare is communism - something to be defeated at all costs.