It is my understanding that grammaticalization is a fancy way of saying that words that contain a lexical meaning can change over time into words that gradually lose their lexical function, but then gain a grammatical function. Someone on this site presented this example:
- originally a word holding just lexical meaning, that could be conjugated like today's wollen in german. Ich will, Ich wollte, Du willst, Wir wollen.
- the precursor of today's will lost its ability to be conjugated and their lexical meaning to become an indicator for the future. I will come, We will come
- Will became even shorter, that exemplifies a further loss of its original lexical function: I'll come, we'll come
- theoretically the last stage will could reach is when it became an affix: I comel, we comel
So far, the information was easy to require, but what about the forces that enhance the transitions from one to a further stage?
What are considered those forces of circumstances to enhance this process within the linguistic community dealing with this phenomenon?