Survival is always considered as the ENABLER of present and may future combos/plays so I took the Fetchlands/islands as example for this narrow and repeating description, which lacks a lots as you realized yourself.

Every single card has the potential to be broken with future printings but that doesn't mean we have to ban Moonlace NOW if they might print a enchantment for U that lets you draw 10 cards if it becomes colorless. The present should be an indicator for WotC's actions ...

The point is: Survival got Genesis, Squee, Loyal Retainer, Iona and now Vengevine over 12 years since it's printing and was always a tier 2 strategy until now ... the 2 main uses; convert useless dudes into bigger ones out of the deck and reanimation of dumped creatures with recurring nightmare etc. were well known and played since day 1 of it's printing.

NOW people started to complain about both facts to be out of bounds?! Dumping mana dudes for Goofy or Knight is now considered broken (even if it costs 1GG and a card); fatties (Iona, Chuck Norris, Vine) to reanimate them (Walla-action, Retainer) too.

Watch those 3 facts:
- It can exchange creatures in your hand for creatures out of your deck for mana.
- It enables reanimation strategies
- GW-Survival kills turn 4 with a perfect grip of 7 and a goldfish opponent

I guess every one can call this ban-worthy as he likes but I refuse to accept much of the logic to ban a card because of the fact that it MIGHT be able to do. All of that sounds like "Ban Ad Nauseum! It CAN draw hundreds of cards!" or the like