Yes, I'm if the belief that if Bitcoin fails, they all fail: alts and SC's.
In fact. I believe the price drop we've seen in the last 24h since the SC announcement is a direct vote of non confidence in what they're doing. I've been very vocal since I heard about them doing this project with a for profit company. The dangers of this are so obvious, Austin Hill's response to me on Twitter giving a hint. Can you imagine him saying that to me after SC's have been established and I inquire about some major change they want to implement that might profit their company? I think the market is worried about this very thing.
this is bold, pun intended
Not really. Think about it. What they're proposing makes me nervous. Why? Because they're monkeying with my money as if they somehow know better.
Nobody wants that. They want certainty and confidence that this won't happen. In fact, the " bargain" I signed up for was exactly this. Yet here we are with a group of core devs et al who feel Bitcoin isn't good enough for them. And they think their for profit company is perfectly ok way to go about changing the bargain.
Almost sounds like your new Fed.
Respectfully, I don't think you've got your head on straight in this one. These people are acting to preserve the value you have on the Bitcoin blockchain.
Bitcoin HAS issues, with micropayments, with anonymity, with atomic exchange, and with the simple issue of having to run a full node (and all the CPU, network and disk that implies) just to accept payments (ok I know about bitpay, coinbase, but then you aren't actually accepting payments are you? You are trusting a third party).
Without sidechains it is very likely that altcoins will be eventually successful in filling these and other application specific roles, which will have a slow but ultimately very significant effect on the Bitcoin price as "value" is put into these other altcoins.
Or centralized solutions will be successful in filling these roles. These places will inevitably go fractional reserve, increasing the effective (if not the actual) number of Bitcoins and depressing price. Additionally, they will periodically do a runner and engage in all the other practices that Bitcoin was made to avoid. Essentially, if centralized solutions are needed to fulfill functions other than fiat-BTC exchange then Bitcoin has failed.
TL;DR: Sidechains preserve the value of your coins by encouraging limited supply.
PS: And as others have said, nobody can use side chain technology to steal your coins if you don't put them on a side chain in the first place.