1) No, frankly. Riptide spam rips
BT Crusader hordes to pieces so easily it isn't even funny, Helldrakes would have a field day, and Eldar have pseudo-rending on their basic rapid fire weapons (and that is just scratching the surface there), to name just a few of the things that are hot right now.
2) No, he's not, and he's trash now.
3) Possibly a good idea, but mostly its circumstantial.
4) Crusader Squads get larger unit sizes and can take two specials (one of which can also be a SCCW) and a heavy+special at 5 man squad size. The smaller unit is probably the closest to 'competitive' you're going to get. Maybe if you had a way of giving a Crusader blob scout/infiltrate/outflank by say, taking an
IC with the rule and attaching it to them they'd be fairly effective.
5) It pales in comparison to the mechanized forces of other chapter tactics/
SM Codex's, and Rhino Rush is pretty much dead in the meta to begin with; never mind with
CC configurations.
If you meant, uh,
LRC spam then I honestly wouldn't be able to give you a reasonable opinion other than its a heck of a lot of points for some 'meh' firepower and almost-but-not-quite-guaranteed insurance your
MEQ will reach enemy lines.
The other problem being that
MEQ tend to suck without decent support (which you will have very little of with 200+ pt
MEQ squads in 250 pt
LR's) , unless you run a blob that tries to do
AT, horde management and contribute AP2 to the butchery of Riptides simultaneously you'll end up with rock-paper-scissors match ups.
6) Implausible Nature has been slow for a while but the posts on it are generally pretty good:
http://www.implausiblenature.net/laeroths-blog.html
7) Probably not going to be any new models unless
GW releases a supplement and completely breaks the trend that has stood up about 5 times now where no new models have been released. In those instances.