Even if for some reason Electrum ever goes down, you can still use this seed to just import your wallet in a different wallet and recover your funds.
Except for the "minor" issue of Electrum seed mnemonics not being usable in any other wallet that I am aware of due to Electrum's use of non-BIP39 compatible seed mnemonics 
Try and put an Electrum seed into Ian Coleman's BIP39 Mnemonic Code Convertor
Also, as far as I'm aware, there is no easy way to "convert" an Electrum seed mnemonic into a BIP39 seed mnemonic... although, theoretically, it should be possible.
Another point is that Electrum can't really "go down". Even if there is no Electrum servers to connect, you can always use any functional version to create transactions offline, sign, and broadcast to the network in any of the multiple "push transactions website" available (e.g: https://blockchain.info/pushtx). So I would say that you are safe to use Electrum.
