Theoretically, it's possible and it may yet come to pass if the banks want additional ways to lend money. The main problem is 1) the residual value of a boat after 36 months is much lower percentage wise than a car therefore more or the boats value has to be made up in the lease, so high payments. Also , all the big automakers run their own financing Ford GM BMW Nissan Toyote etc. who act as the banks to lease the vehicle. These manufactorers make up most of the leased vehicles, you would need boatmakers to offer the same type incentives and programs Even the big boat guys Bombadier etc. are dwarfed by a Ford or GM in the bankroll dept.
By the way nationwide leasing has dropped 30% in the last 2 years