Teams would still tank, it would just widen the field of teams that would try.
Also the more you flatten the lottery odds the more you defeat the purpose of intending worse teams to get higher picks. Instead of rebuilds lasting 3 or 4 years as teams sit at the bottom enough to accumulate a good core of high picks, teams would be stuck on a treadmill for longer hoping and wishing that maybe eventually they fluke into winning the lottery and getting the kind of player that can change their franchise or hoping that maybe the draft gods smile on them and one of the kids they pick at 7th-10th every year ends up happening to be one of the steals of the draft.