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>Does that mean that after that date, we literally will not be able to use https://wallet.trezor.io/#/ with our Trezors and therefore MUST upgrade to the Suite? The web wallet interface will be taken down?
Yes, that is definitely what they are implying. Of course, we won’t know 100% until it happens, but they have mentioned doing this in the past so it seems like they are finally doing it.
Also, they kind of confirm this in one of the github conversations I ran across as well.
Of course, you are not required to use Suite at all. You could use other 3rd party wallets like MetaMask, MyEtherWallet, Etherreum, etc.