1. Is this the last days?
Don't know, don't care. No where in the Bible does it say we should be plotting to find out.
2. If so, was a preaching work to be done? If so, in what format?
People should go to Christianity because they know it is what they want to do, not because they were told to.
3. If you conclude that "organized" religion is not needed or sanctioned by god, what do you believe was to be the desired method of worship?
It doesn't really matter. Everyone has their own method, but as long as its towards God it shouldn't matter at all.
4. Given the fact of the Tetregrammaton's obvious existence, do you believe that the usage (regardless of the uncertainty of pronounciation) of god's personal name is desired of god? And, please, try to rule out a "no" JUST because of the fact that the JW religion generally started the revival of this usage.
You can call God by whatever name you want, there is nothing against it in the Bible.
5. Did god and jesus basically expect us to congregate in "loosely" knit congregations ( as described in the book of Rev.) for support and fellowship only, as we await the end?
No. I believe that God and Jesus did not want us to wait for the end. The end has no given date or anything so what is there to wait for?
6. If this is the case, then.....generally speaking, does this not mean that "all (christian) roads lead to the same place"......that old saying, which the JW's like to poo-poo, so as to endorse the concept of one true religion?
I really do not know.