Amazing, has a legitimate news agency ever joined a roadgeek discussion forvm before ('Fox 11 News' - WLUK-TV, channel 11 in Green Bay, WI http://www.fox11online.com/
Anyways, there is a lot that can be read into the 'will not get a number of its own' statement from WisDOT. Recall that a few years ago, WisDOT submitted a 'suggestion' list of four potential route numbers to AASHTO (the 'American Association of State Highway and Transportation Officials', keeper of the standards and holder of the registered federal trademark on the snazzy interstate highway sign shield design) for US 41's pending interstate promotion - '41', '55', '57' and '243'. Two of them, '55' and '57', would be extensions of already-existing cross-country interstate highway routes, both of which now end in the City of Chicago.
I can see much merit in either of those two numbers as US 41 is a well-used cross-country highway, not a local loop or spur freeway, and, IMHO, is well deserving of a two-digit I-route number. Also, either one will give the very confusing I-94 south of Milwaukee a proper north-south route number (the north-south Chicago-Milwaukee I-94 highway is signed as being 'east-west' with 'westbound' being towards Milwaukee - yes, it is confusing as all get-go for those not familiar with the road). Either will also make navigating the 'best' routing around Milwaukee for traffic transiting between Chicagoland and the Fox Valley (FdL, Oshkosh, Appleton, etc) as right now, that corridor, I-94/US 41 <-> I-43/894 <-> I-894/US 45 <-> US 45 <-> US 41, has no single route number - even though US 41 is on it at either end. Again, it is majorly confusing for those not familiar with those roads.
In my conversations with Kim Rudat from WisDOT's Green Bay office a couple of months ago, he also said that the number '41' was pretty much out of contention and seemed must 'bullish' on it ultimately being '55'.
We shall see.