Correct, at the moment upgrades happen much quicker than before - if the market stays this positive. But even at Lufthansa you will wait your 10+ (rather 15 to 20) years before you will get a chance for the left seat. On the smaller spinoffs (Eurowings, Discover etc) it is going to be quicker.
At least the money and benefits will be much better at legacy carriers while you are a first officer and you won't have to be in a hurry to save money for your pension.