Gold can be changed to 75k (reducing the number of golds and will also reduce the pressure on outstation lounges). Platinum can be kept at 150 k itself. However this will reduce the number of pax flying EK after they hit silver as there is nothing to look forward to after they hit silver ( if they are sure that they wont male gold
The gap is indeed so wide that there is little incentive to fly EK once you pass 50k unless one's travel is really extensive and very much exclusively on EK.
If anything, since there's little to gain for those 100k travelers given the low likelihood of reach Plat that it's almost an incentive to try other airlines once Gold is reached. It can be a loss to EK of the revenue equivalent of ~50k tier miles from relatively profitable customers, which is not insignificant.
I agree the gap is too high, I would increase the number of miles it takes to reach Gold (that's purely a selfish point of view). Maybe 40k = Silver, 85k= Gold and 135k = Plat.
The argument that once a flyer has reached Gold and there's little incentive to keep flying on EK, this doesn't 'fly' for me.
You fly and gain tier miles to reach certain levels, those levels afford you specific benefits (both tangible and non), why then change your flights to another carrier and start from the bottom again, with zero benefits - is it just so you can have a 'gold' card in your travel wallet?
I'd argue that it makes sense to keep flying with one carrier (EK in this case), even if you stand no chance of reaching the next tier level you'll at least stand a better chance of op-ups and you'll be earning miles that can be used for upgrades.