You see, I used to believe that as well because after all, this is what the conservatives were saying for years but now we can see that those words were lies. The economy is pretty much in ruins and yet if there was an election today at least %30 would still easily vote for him simply because they like his ideology. It doesn't matter how bad the economy gets.
Erdoğan knows this very well. Just last year, Erdoğan himself was against opening Hagia Sophia as a mosque. He even scolded some of his voters saying "You won't even fill the Sultanahmet Mosque, we won't be played by these tricks". He also added in a live interview that the Turkish state was running hundreds of mosques worldwide especially in the western world and he wouldn't risk retaliation against these institutions by changing status-quo with Hagia Sophia. Only one year later, he not only reopened it as a mosque but turned this into a show by inviting his party members as VIPs for the Friday prayers
But of course, conservatives aren't stupid, that's why I said they will be satisfied only until the end of the year but by then I'm sure Erdoğan will find other things to keep them going until the elections.