At this point his platelets are still at a safe level so waiting seems smart. They might stabilize at a safe level, it's too soon to know.
If they drop too low, you could try Rituxan again, it is possible I think that it could work differently now that he is spleenless. Then there are a number of other drugs to try including nplate and Promacta, the newest ones that increase platelet production.
You should read everything on the PDSA website, including the treatments page!
Good luck,
Erica
And she was!
Diagnosed May 2005, lowest count 8K.
4/22/08: 43K (2nd Rituxan)
10/01/09: 246K, 1/8/10: 111K, 5/21/10: 233K
Latest count: 7/27/2015: 194K