Loss of car counts have been an ongoing issue. Not only Legends Cars, but Dwarf Cars and many other classes. Also, tracks are suffering from low attendance in some areas.
I get the weight differences for different engines. Still; The cost of an engine can be detrimental to some. The installation is simple; Fab up some new mounts, engine adapter, U-joints, perhaps a different driveshaft length, etc... Pretty straight forward. Still, the cost can hurt some of the budget racers. Legends are similar to the Dwarf Cars because that platform was the roots of Legends Cars. INEX took that plateform and made a national set of rules and a spec racer out of that. The shift to Wilwood calipers, aluminum spindles, etc... is nothing new or earth shattering. It has, however, put a crimp in the budget racers' pocketbook. That is why rule changes get evryone in such an uproar. Always a lot of discussion both pro and con. Good for our little sites page views and posts; Rough on some racers with little to no budget. Whatever the answer; It will be a trade off.
Steve