That depends. Is it a necessity right now? Or do you think your legendaries (and other mythics if you have them) will sustain you for the seasons to come? If it’s not entirely necessary to you, and you aren’t too enthralled by either mythic this season, you probably could save. Otherwise, it wouldn’t hurt to go for it. As stated previously in this thread, it would be best to wait until the last week (since it’s so late in the season already) when they preview next season to make your final decision on whether or not you’ll go for a mythic this season. Nevertheless, this season’s mythics aren’t bad (certainly not as bad as people made them out to be at the beginning of the season).
It is entirely possible.
It shouldn’t be, as long as you limit how many rubies you use. You’ll have all of next season to reacquire all of your resources.
The first event next season is a breeding event. It will be best to wait until the second one. This does not pertain to the Draconics, however, because their sequence resets each event, and is more or less the same every time.
Coming back to this… did you mean “mythic seasonal divine”? Mythics and legendaries are two different dragon rarities. “Divine” is the overall term.