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Bettereze
Never say never but I think it's unlikely. The reasons for a referral scheme for any kind of business haven't necessarily gone away but aren't being approached in the same way any more. There's nothing I am aware of about restarting referrals.
If something similar were introduced I'm sure it would be announced in lots of places, including here in the community, but I would not hold off on recommending someone switch on the off chance there might be a referral scheme in the future.
The best plan for bringing new customers to a business is to provide the best service at the best price so that's what we're trying to do.