GitanesBlondes which era did you choose for reference? Because there were periods when more than half of the grid was running DFVs and there were cars which successfully competed without major changes for a few seasons, and there was GoodYear tyre monopoly for a few years in a row (drivers did complain about them too).
Apart from ban on tyre blankets and fuel system simplification I think the list is sensible.
Would it help to cut costs? Don't think so, however it would make a point of diminishing returns a bit lower, giving more hope for a small teams to compete -- which will in fact improve their chances of getting bigger sponsor contracts and so on.
Look at Sauber which is suffering from being overweight compared to Ferrari. With standard crash structure you remove a variable where Ferrari can pour money into and safe few grams compared to Sauber.
A simpler front wing will not generate such complicated flow pattern and the deficiency of FW performance between Marussia and RedBull will be smaller.
Will it make F1 spec series? With the list as it is, no (IMO of course).
Were there many people complaining about single SECU? Not really. About same refuelling equipment? Not really. That the whole grid purchases brake disks and pads from just a few manufacturers? Not really.
Does anybody complain about standard side crash structure this year?
Of course there is a fine line to take, but IMO it's pretty good.