Very long ago, some experienced here said they would be a big failure if they did not reach 80mhs in eth with vega cards.
XMR will soon switch to new algo, and look like vega will stay as one big epic fail.
Like their custom version, came out too late in too small a volume.
Xmr will switch algo provided some asics comes to play according some wild rumors.
This is big if.
Besides, they will just change some parameters in the pow algo, in order to block asics. It is highly probable that vega will still be very good with the new version of cryptonight, if the switch really happen.