Spitz1 Newcomer

Couldnt find the answer for this big debate which is going on between a few of us....
Scenerio:
A twin cessna is getting ready to depart from an intersecting runway. On short final is a B737. The twin gets put into position and hold and the B737 touches MAIN gears down right before the intersection portion of the runway and crosses the the remainder of the intersection portion nose gear up. Is the cessna able to depart right away once the B737 crosses?
The debate on this is that some say that wake turbulence ends once an aircraft touches down (.65), however, others argue that wake turbulence is still being generated until ALL landing gears touch down. Ive tried to research this online, but have come up empty handed. Could anyone help me out with this question? If you find the answer online, please include the link with the answer. Thanks,