Realistically, if CS made a 747 package (100,200,200 Freighter and perhaps the SP) Then I think it would really be their best sell BUT ONLY if the systems can beat the old Ready For Pushback 747 for FS9. Simmers regard the RFP747 as a VERY good aircraft and CS can't match or beat that aircraft in systems modeling then it won't really go over well with potential buyers.

The performance and handling of each model has to be different and accurate along with more options to customize your 747 with different equipment used by different airlines. For example, back in the late 80s early 90s, BA used FMS on their 747-200s. So perhaps an option for having INS only, INS and GPS (those small bendix models were used quite a bit along with the INS) and an FMS version.

TCAS should also be included as an option along with the option to have EFIS displays as seen in this photo.
http://images2.jetphotos.net/img/2/1/2/8/65373_1207330821.jpg

In the end, with all of these features, the high price tag won't be in question. The bottomline is that people pay for quality and options. This was quite evident when certain 737 made one developer very wealthy..