Spiral sequence has been required in the ladies short program for almost 20 years already, so I don't have a problem with leaving it there. If anything, I'd like to see one of the men's SP step sequences changed for spiral or field moves sequence.
In my ideal version of the long program well-balanced program rules, skaters of both sexes could do up to three of the following kinds of sequences:
step sequence (as currently defined, although I have some tinkering I would do with the level requirements if it were up to me)
spiral sequence (ditto)
field moves sequence (requires at least two of the following: spread eagle, Ina Bauer, shoot-the-duck/hydroblade -- that could be two of the same kind of element if performed on different edges/in different directions -- plus a third position that could be one of the above or a spiral or lunge, with level features for various difficult variations)
small-jump sequence (sequence of jumps of 1.5 or fewer rotations, any takeoffs and landings allowed, which may be connected with steps and turns; features for certain kinds of combinations, jumping both directions, special air positions such as splits, etc.)
This year's US requirements for novice long programs allow both men and ladies to choose either a spiral sequence or a step sequence. Some novice men who can do decent spirals choose that option -- it's a lot easier to achieve level 3 or 4 in a spiral sequence than a step sequence.