I may not get my arenas or fighting pits so I feel your pain. It's easy to try to support a removed feature if you're not in any way attached to it.
I believe that is a wrong attitude and I do not endulge myself in it.
For example, I have never in any TES game used bow and arrows. They do not appeal to me.
Does that mean I would not care if they were removed?
No, I would care deeply.
First of all for all the people who very much enjoyed the feature, this is called empathy.
And secondly because I feel that a game that has lots and lots of things is better than a game with very few features.
Even if some of those features I never use, the removal would be indicative of a trend I am not fond of.
A trend we saw with Oblivion and now continued into the extreme with Skyrim, where it seems they went on a berserker rampage of removal.
" First they came for the communists,
and I didn't speak out because I wasn't a communist.
Then they came for the trade unionists,
and I didn't speak out because I wasn't a trade unionist.
Then they came for the Jews,
and I didn't speak out because I wasn't a Jew.
Then they came for me
and there was no one left to speak out for me."
(M. Niemoller)