I am in some of the Ethereum Gitter channels, and they have a few immediate problems to address, but they have a very strong and talented team of developers in all the channels I have visited and are great problem solvers.
As for the scaling issue, that is something Ethereum will address when they release their Metropolis release of their protocol and move it from a PoW to PoS system. It may happen this fall if they can clean up the current problems (like with the sinking of their Ropsten testnet which replaced Morden after that was taken down by hackers), their mainnet has been eminently stable for sync since they upgraded their main client, Geth to the 1.5 series using a new blockchain structure. And if they have no major problems in next Geth release to launch new testnet.