AB is Antonia Bayle, a Live server. Yes, if a new TLE comes along, you will be starting from scratch. Everyone will. Every TLE before has made it to about Destiny of Velious expansion before essentially being replaced or at least it's successor being announced. Which I find kind of ironic, because a lot of the problems that TLE has had in the past (itemization for example), aren't nearly as pronounced post-DoV, owing to the subsequent expansions being based on the modern stat mechanics from the outset. Either way, the current server is on Rise of Kunark, so if history repeats, you're looking at about another 7-8 months on Kaladim before the next one is announced.