In my opinion using a turing complete language for writing smart contracts on an immutable blockchain is not sound enough and too error prone. Just look at all the hacks and silly mistakes that happen to due to questionable design decisions in Solidity. It may get better with improved tooling, but the way I see it Ethereum smart contracts still need to get a long way before being trustworthy.

That being said, Bitcoin already has some basic scripting capabilities that I wouldn't underestimate. There's even layers on top such as XCP and OMNI that allow for token issuance.

Further down the road we might even see something like Simplicity:

https://bitcointalk.org/index.php?topic=2338626.0;topicseen

Which strives to increase Bitcoin's scripting capabilities without decreasing security.

There are already other smart contract platforms. Some were originated from Ethereum forks (such as Ubiq and Expanse) and others are independent.

However, Ethereum is still under constant development and they have new releases planned to solve the issues you mentioned. You should try to read about the Metropolis release planned for later this year and plans of implementing Proof-of-Stake and other improvements in the network.

I googled it and found a post from february that looks interesting:
https://www.ethnews.com/ethereums-road-map-for-2017

So, for me, Ethereum technology still plays a major role in the future of blockchain and I am not looking for another smart contract platform to support.