All things are always subject to the possibility of change. If they did not change the availability of those characters, how many players would still be ranting about the length of that farm ?
Besides, 900 Crystals for the refresh of their events, for 10 additional shards, is equal to an individual shard value of 90 Crystals. Until now, shards purchasable on Shipments are either valued at 50 Crystals per shard (for older toons), or 80 Crystals per shard (for newer and/or stronger toons). So, even if you paid refreshes every time, you only spent an extra 10 Crystals per shard - IF Mother Talzin and Wicket are released at the standard fare of 80/shard. Might go to 100/shard. Nuff’ said...