the thing that bitcoin cash advertisers intentionally forget to tell you is that despite them increasing the block size, the size is still limited! how long do you think it will take for BCH blocks to be full if it replaced bitcoin today? or nearly full and the spam attack starts? the sales pitch saying "cheap and fast" is because 95% of the blocks are not exceeding 200 kB while bitcoin blocks are 99.99% at >1000 kB
increasing the block size alone is not a solution.
it is hard to say. to be honest i do expect some down time although the market sometimes shows all signs of wanting to continue the rally.
but if the downtime happens we may see at least $40,000 by the end of the year. but if we can get over this current backlog and do something about transaction fees (possibly spam attack), then we can start the rise so much sooner and be at $60k and more by the end of the 2018 since we will also have LN by then and things will be solved eventually.