I'm staying long on ETH as there is still plenty of upside. Aside from serious network effects it's got a number of key strengths - talented and large developer community, a selection of major projects building on it (e.g. OMG, ZRX, BAT, REP, MKR, etc.) and a lot of institutional / VC money behind it.

You are right that it doesn't scale especially well, and will likely never achieve transaction speeds of some other newer networks. However, layer 2 solutions (Plasma, sidechains) are getting rolled out and sharding isn't too far away (maybe 1.5 - 2 years before its ready). In addition, interoperability protocols could allow ETH to play to its strengths (altho again, these are still at least a couple of years away from working IMO). Shift to Proof of Stake will also be happening in first half of next year, which will lock up a lot of ETH, and likely cause a significant spike, as I don't think this is fully priced in.

I like EOS as a hedge against ETH. Their war-chest it has is massive, and there should be a load of interesting dapps coming out over the next few months. The advantage they have is that they can see which ETH dapps/projects are doing well and simply clone them, and in theory run them cheaper and faster.

One major reservation I have with EOS is the power of BlockOne. Its a highly centralizing entity, and has done some dishonest marketing (misrepresenting TX/sec nos, calling it a blockchain when no cryptographic verification or immutability).

As for Steem, I have to agree it looks like its days are numbered. I'm interested to see what the EOS clone will be (as there surely will be one). I will hold on until I see the impact of communities and SMTs, but I think sometime next year (or maybe in 2020, depending on market) I will pull out of Steem.