I’ve been using trackers since Amiga 500 days and am very much used to the traditional tracker style of showing the notes, but it doesn’t mean that bringing out some new ideas and features is necessarily a bad idea. Combining the tracker interface with some visualization options that other DAWs use for linear sequencing, why not. I use lots of other sequencers too for my work including Logic Pro, Reason, Reaper etc. but always feel drawn to Renoise, thanks to its fast workflow.
Anyway, we are really just talking about the different ways to visualize the note data here and like Garf mentioned, it could all be optional and turned off when needed. Nothing of this would break the tracker paradigm that we all here love. Clearly there is demand for these kind of features, and not just from those new to trackers but also from many long-time tracker users.
Of course all of this should be done in a way that it makes things more clear and not messy. I tried out Radium but didn’t like it for the very reason that the interface looks like a mess. Renoise is very elegant and polished when it comes to the UI and any added features are clearly carefully planned before implemented. I’m sure there is a way to implement the note lengths and possibly waveform view too so that it doesn’t look like a mess but instead can be helpful.