Don't you know that some altcoins are just clones of bitcoin? Some have own development. So there is no any common "altcoins technology". If you talk about technology you can talk about exact product or brunch of products only.
I don't think just some, but all altcoins. I think the idea of altcoins was all copied from bitcoin and modified in different ways. When it comes to cryptocurrencies, I believe that there is only one technology, that is bitcoin, there is no technology in the altcoin market. Because bitcoin was created with the intention of being a P2P payment method, Satoshi did not intend to create a project with tokens to sell for profit like altcoins. Although altcoin projects are constantly introducing new technologies, but the ultimate goal is to sell tokens for profit. So it can't be said that they are creating new technology, they are just creating a pump and dumping market.
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Well, I'm not so sure in that. It can be so or near so for multiple projects which are just making another payment processing system. But we can talk about some ideas of using a distributed ledger for improving a privacy level: like sending documents or operating a smart house and some other projects. I'm not sure they'll succeed, but at least they have a potentially working idea which can be implemented with blockchain or DAG or some other distributed ledger solution. And those projects are not just clones of bitcoin, doesn't matter if they can succeed.