No disrespect to your wishes, but I would be astonished if Apple ever reintroduced a 17" MBP. I think that the market is simply too small to be of interest to Apple.
I know that Dell, HP and Lenovo all produce 17" workstation laptops for the professional community, but my feeling is that these big machines just don't align to Apple's marketing "vision".
I appreciate that there is a real use-case for these machines - if you need a fast quad-core machine with 32GB RAM and multiple drives (the Lenovo W510 supports 2 HDD/SDD + an mSATA drive even in the 15" model, I believe), then your only option is to go with a non-Apple solution and use Windows or Linux.
However, I think Apple has firmly gone into the consumer electronics business and the sales of "wow factor" super slim and light laptops easily compensates for any lost sales to the scientific, engineering and software development users who might want a more powerful portable computer.
Sorry for your loss....
That said, maybe you need to consider why you want a 17" laptop? If it just screen size, then the solution is easy - plug in to an external. I travel all the time with my MBA and I *always* connect to an external monitor in my customer's offices if available - just about any office or lab will have a monitor you can use if you ask nicely.
If the problem is CPU / memory grunt, then consider either a portable server (I take my 16GB 2xSSD Mac Mini with me to augment my laptop), connect to a server back at base (I have a 32GB machine in the office for the purpose), or subscribe to a cloud provider such as Amazon, Google or Azure.
I really think the time when you need to cart around a big laptop is coming to an end for many types of work. If you do video editing or some task that need lots of power on the local machine, you may still need a beast machine, but these use cases are becoming less frequent. But if you need it, then you need it! You may just have to look at non-Apple products to meet your needs.