Hello everyone,
What would happen if I had some bitcoins in a Nano S wallet and someday ledger decides to drop the project. Would I be able to still use my wallet somehow if I had my seed?
Yes you can import it in a wallet which is compatible with that seed. I know electrum is, so you can restore your wallet through your seed in Electrum which supports BIP32 and BIP39. I am not sure but even Mycellium supports this, so yes there are a few options.
And even if ledger decided to drop the project, the current Nano S wallet should still function fine when using a client such as Electrum or the other existing wallets that support. I'd imagine their own App would function as well, you just wouldn't receive any new updates.