No, there is no concern that the term limit will be removed or expanded. It hasn’t happened since the amendment was ratified, even after multiple attempts from politicians of various rank and from each party.
There are plenty of things to be concerned about, but the “trump will become the life long leader of the United States in his presidency” rhetoric is stupid and unfounded.
Nixon couldn’t do it, truman couldn’t do it, trump is not as competent or capable as either of these presidents. It will not happen. This is literally the same shit republicans used to say about Obama and it didn’t happen then.
He would have to convince 3/4s of the states in both the house of representatives and Congress to ratify, and there is no way he could do that.