Come on now, I can't say I've had any problem with Mozzies in Calis in Octobers for a few years
The disadvantage Portugal has is that accommodation is so much more expensive but with cheap flights it sort of all averages out. The increase in electricity, transport & manufacturing costs (electricity mainly) will be filtering through out of season and showing in tourist season - there's no way you can make bread/furniture/washing machines at the same price when your electricity has gone up 62% in the last 12 months. You can try and cover for it but it will have to be passed on in the end.
Like I said, 2020 is going to be tough for tourism, and I hope and pray it won't be decimated by a terrorist campaign from those over east. Last year for example I read Facebook posts about the conflict on the Syrian border - people being concerned in Hisaronu because they had told not to leave their complex under any circumstances.
It's not a logical game, tourism. Especially not in Turkey which always seems to be vulnerable to some bad luck, earthquake, refugee crisis in Europe, war in adjacent country (of which Turkey has many), attempted coup...
Then, with all the above, a PKK campaign in the cities and resorts - well, the implications on tourism are beyond the imagination..