I think that the pilot projects, testbeds or trainings are/could be already covered by the temporary assignments for which I think this proposal was not intended to change anything.
I think that one 16bit ASN per LIR limit is not prudent as LIR != route end point, this notion that LIR is also "end customer" or the sole user of the network has been established in the last few years with the last /8 policy where I guess most of the new LIRs are actually also the route end point for their allocation, but if you look back LIRs were/are the middle-man between RIR and end customer which actually (could) need their own ASN so the need for the 16bit ASN exists at a third party and not directly with the LIR.
I guess the need for 16bit ASN and with that requirements to get a 16bit ASN should stay unchanged but on the other hand the limitations for 32bit ASNs could be more relaxed.