Perfect timing.. I just got off, from phone with our partner. We were exactly discussing about the same. They did not say that exactly, but eventually all customers should go that route down the line. Citrix has closed (or will close) all other options except subscription model.
We don't want to move to subscription licensing, we are on perpetual on-prem license and want to continue that by purchasing SA. what our partner says is, if we have 100 perpetual licenses as of today on LTSR, we can purchase support for now, but in next year or the next year, citrix may only provide subscription licensing model. Also, as of today, we cannot get a new perpetual license. We have to go with subscription model only if we need new licenses.. we can only purchase support for whatever perpetual licenses we have as of today. Not sure how many more stupid decisions does Citrix come up with.