The "%" is an IEC Standard, it's not going away soon but 1I, 1M etc. is the best 90 Series alternative, the PAC does not need Addresses.
GE Fanuc is not going to discontinue the 90-30 or 90-70 in the near future, there is just too much revenue generated by these two product lines for that to happen. I suspect that we will see them change as technology changes and chips become unavailable, but GE Fanuc has a history of stock pyling obsolete chips so that typically they are phased out over a period of time. Look at the Series 6, it took about 7 years from the time GE Fanuc announced its retirement until they stopped selling new ones.
I just returned from a couple of days of training on the PAC system and the above is how this question was answered by GE Fanuc management. I for one believe them on this one.
The Series 90 Micro was out of their control, the factory that built them one day announced that x months from now we are closing. GE Fanuc made a bad decision by not having more than one source, or at least better control of the source. I doubt that will happen again in my life time.
The comment by the Siemens distributor is what gives distributors and reps. a bad name and it is really bad form and usually indacates desperation.