The results are disappointing yet we should see the full side of the glass too. Basically the results are saying: "every second person in this country hates you and does not approve you". Not sure how influential these numbers will be in his future decisions but they are all aware that they cannot do anything they want otherwise half of the country is waiting to protest.
To me it is funny to read that people expect too much from the main opposition part - CHP and blame them for all the failures. What people don't understand is, Turkey became like US where people vote between 2 options in the end and this is beneficial for center right/right wing parties where main opposition is social democrats. Looking at Turkish people's political choices, it can be said that roughly 60% of the country identify themselves as center-right/right wing, where the numbers are growing with the addition of new citizens, mainly refugees. On the other side, left-wing people are probably around 35% of the country, where the numbers increase with youngsters voting the first time. So in this equation, it is very difficult to expect a social democrat led opposition to get more than 50% of the votes, more importantly, it was an extremely difficult task to unite left wing people with kurdish and nationalists at the same time.
What people should blame is lack of other strong center, center-right parties which can/should steal votes from Erdogan's government. So many of us forget a close history, late 90s, where Turkey had 4-5 center right parties in parliament, all getting around 10-15% of the votes each. Today, they are all under the same umbrella, the union of Erdogan which also explains why he involves any potential leader rising with center-right background (with a few failures such as Meral Aksener). His health condition looked terrible during the last 6 months and I am sure it will get worse, especially when the country is dealing with so many problems right now. To me it is very clear, if Erdogan quits, there is noone as strong as him to unite all those center-right voters, which means we might go back to having 3-4 parties sharing those votes and therefore seeing coalition governments. This is of course unless they make a drastic change in constitution which I assume is difficult due to 50/50 votes in the election (not enforcing legally, but creating a psychological barrier).