Not really; we were on our way to a conservative nominee until Rubio fell apart. Also, had Rick Perry gotten that last podium instead of John Kasich in the first debate, the non-conservative/non-Trump standard bearer would be Jeb! Bush or Christie, in which case Cruz would be leading in delegates right now (assuming the same Rubio collapse). So no, a few unfortunate events have contributed to the current position, not a lack of conservatives.
Trump is leading in delegates because Kasich got the last podium in the first debate?