I think you need to clarify what "revival" means to you 3db.
I went from a time 20 years ago when people begged me to take the tape deck along with the other equipment, as a "freebie." Metal tapes went for .25 cents at the thrift or free from the garage sale. There was a time when Beanie Babies were worth more than cassette equipment. Now it's the opposite, there's several dozen new boombox designs, lot's of component decks and guys still making new media at an increasing rate. My tape decks have wildly exceded in value compared with my other audio equipment. Record stores are actually stocking new cassette releases.
While I don't see many component decks, I do see a ton of boomboxes in commercials and movies these days, yep even old Walkmans are showing up. It doesn't take a rocket surgeon to see the legitimate interest in the hobby, I know for a fact your paying much more for your internet finds than in years past.
Yes and no, there has been an uptick in interest, but that's not hard when you're already at the bottom as you said. There will never be enough money in the cassette niche for a manufacturer such as Pioneer, Sony etc. to ever release another quality cassette deck. Also as much as prices are up, they're only up on some pieces, being mostly high end or to match collectable gear stacks.
I could go out tomorrow and buy a beautiful, functioning late model TOTL 3-head deck with excellent specs for about $70 bucks ($50USD), but I don't need another one, nor do many others as it's been sitting for sale for about a month now. Not a sign to me of huge interest in a format. Aside from Naks, vintage silver Pioneer, 70s Marantz and a very few others, cassette decks don't sell for very much money. I own a bunch of 3-head decks still because I like to try out different ones once in a while, and it's not really worth my time to sell them again so into the storeroom they go.
