Given the material of a tennis ball I would have thought it was an ideal surface for the virus to stick to?
I don't know as fact, but would guess that this property might be one of the reasons why tennis is ok.
Using Trystan's "rainforest" analogy from the scientific thread the other day, a tennis ball is possibly one of the best ball surfaces to 'trap' the virus and make it harder to spread by touch. The cricket ball surface being smoother - and deliberately polished during play - would mean the virus is more easily dislodged onto other surfaces (e.g. fingers and clothes)
...and they spit on it 
An essential part of the game.

The condition of the surface of a cricket ball is critical to the way it behaves in flight when bowled. I could imagine that a ball liberally dosed in sanitiser each time it is returned to the bowler might behave very unpredictably when bowled - being potentially dangerous, and possibly opening up the possibility of cheating by the creative use of sanitiser on parts of the ball.
So if I've guessed right, although the game could be made safe from a viral point of view, it could be physically less safe, and impossible to have a 'fair' game.