Kettling people who are blocking roads is not one of those great ideas, and beating people up surrounded by tourists and cameras in the centre of town isn’t a great idea either.
The thing is that there isn’t a lot they can do right now apart from remove people. What I think will happen is increased attempts at intimidation via legal threats, personal targeting and punitive sentences (at some point) and also attempts to restrict movement and assembly, though the latter is difficult and can never be very effective. (ETA: see the post from the netpol guy on the last page.)