Why does it always have to be someone else's problem? Why can't a cyclist take some responsibility themselves for this sort of thing. Bicycles and trams have coexisted for over a century and this has never been a problem until recently.
They didn't coexist happily and in most places for most of that time in this country, they didn't coexist at all! From the 1920s onwards, tram systems were being dismantled; on 4th August 1938, the Midland Daily Telegraph reported "It will be good news to those cyclists, motor cyclist and light car owners, who, during the last few months, have muttered inprecations as they have swerved and bumped their way over the obsolete tramlines in Earlsdon, to learn that the metals are to be taken up"; from the 1960s to the 1990s, Blackpool was the only place in this country with trams; and in the 1990s, the new Sheffield tram network was involved in over 30 rider injury reports a year (over 50% seriously) with only quite a small network (An Investigation Into Cyclist Safety on the Supertram Network In Sheffield, South Yorkshire, Sheffield City Council, December 1998).
Across Europe, they've not been coexisting happily. Many places have sought to mitigate the problem by designing perpendicular crossings and other things that UK highway authorities don't do... but now there's an easier solution, which is being adopted.
Rubber in the slot? While we're at it we could fill in every cattle grid, fit anti skid material to every manhole cover, and roughen up the surface of every white line, just so you.Don have to pay attention when out for a spin.
If you lived a hundred-odd years ago, would you have been arguing against tarmac replacing the dirt, gravel and cobble roads? They were fine if you used your eyes, weren't they?
And anyway, around here, there often is anti-skid tape or tar+chips on many manhole covers, plus they don't seem to use the slippery white plastic road markings that North Somerset did (I don't know if this is a general improvement or something special here). They even fill potholes and grit busier roads when it freezes... probably they shouldn't do that either because people should just pay attention more!
No, we've got a history of removing sources of danger from the roads, especially when it's relatively easy, so let's fill the tram tracks where cycles are being routed along or across them.