Maybe so, but the ich is never completely removed in that way. It will always strike when the fish are weakened or vulnerable due to stress, so if you are still stocking your tank an outbreak may be inevitable without the use of meds (you can't really get around fish being stressed when moved from tank to tank).
EDIT: Unless it is indeed possible to vacuum the ich out, but I don't know if this can be done. Any info on that?
As part of the lifecycle, ich encysts on the floor of the tank. If you vacuum regularly while the tank temp is too high for reproduction within the tomite (cyst), you can reduce the parasite load in the tank enough that the fish immune systems will be able to fight off the infection and no longer host it. Fish in less than pristine water are stressed and more vulnerable to ich infestation, if you keep up wth the water changes this is less likely. There are theories that a few dormant cysts will stay in the tank and could reinfect the fish at times of stress... However in this stage meds are not effective (meds only work when the ich is free swimming) so whether or not you use meds is dependent upon the sensitivity of your fish to meds and temp. Either way, ich is in the tank and stress must be minimized or else you risk reinfection. The stress of the move is part of why either use of a QT tank (with QT tank conditions being brought in line with that of the main tank and any needed meds administered), or else a fishless cycle with a complete stocking is advocated.