I think we have three issues here:
1) It seems we would like to have some deviation from current 9001, higher and lighter, to satisfy the need of various industries in various situations. I believe people are doing this. From the higher end for example, if a medical device OEM buys a critical part from a 9001 supplier, some additional requirements beyond 9001 may be applied (but not to the extent of 13485 which the supplier does not have and needs not to have. The lighter end will obviously help many small businesses that are expert in their area but have no desire to get 9001 certified.
2) Do we want to make these deviations "official" by revising current 9001 back to a 9000 set? I will say take it or leave it. 9001 is general and needs to remain general whatsoever. From a single 9001 to a triple-set may not solve the problem, and many small companies still will not seek for certification for financial reasons.
3) That some CBs certify companies to 9001 based on incomplete conformance is a bad practice. A triple-set will not solve this problem.