Sorry, but I am not guessing, I am stating facts. I have done everything I mentioned myself.
You say you are stating facts. But there are some things it is simply not possible for you to know.
For example, I got a season ticket about 10 years ago from a name change (it was allowed at the time). They wouldn't let me transfer my away credits to my season ticket and told me I would have to keep using my fancard for away credits. The terms and conditions seem to forbid buying tickets on a membership if you are a season ticket holder. So, despite you stating a fact that if I purchase a membership my history will move across, I might not be allowed to purchase tickets anyway because of relatively unique circumstances.
Also, "Your history is never lost". Hmmmnnn. Well I reckon that might create a tension with GDPR legislation and the clubs privacy policy of only storing personal data for as long as necessary. If someone hasn't bought a ticket on a fancard for an extended period, there might be a legal obligation to delete their data.
The message that the club is discontinuing fancards could mean a whole host of things for different people with different circumstances. We need clear communication from the club, rather than guesses.