That is true. Lack of action alone doesnt mean much. But it's not alone.
1. Expressing they will "go back to DMC if fans want"
http://www.vg247.com/2012/07/14/capcom-100-behind-new-dmc-original-style-may-return-in-future/
This is also a indication of them not considering to create DmC and DMC. Because going back to DMC from DmC means they are leaving DmC behind.
Despite stating they will explore original DMC, there have been no statements or actions saying they will as of now. And this is important because they said "We will if fans want", and fans clearly do. So why have a DMC game not been announced yet?
2. Speaking of DmC as the successor
http://gamingbolt.com/capcom-didnt-want-the-series-to-die-explains-why-dmc-was-outsourced
There is no sign of them talking about DMC as if it has any relevance for the future in this quote.
3. DmC sequal hinted at
http://www.gamespot.com/news/capcom-aims-for-more-devil-may-cry-in-2015-6378261
Here Haruhiro Tsujimoto expresses himself about what serie (DMC or DmC) that is relevant.
DmC being result of outsourcing to Ninja theory
And they want to create DmC sequals every 2.5 years but can't for now because of outsourcing takes time.
Take notice of "DMC Devil May Cry". I mean when we talk about DMC serie, we either say "Devil May Cry serie" or "DMC serie". Here it's clearly speaking of DmC Devil May Cry sequal. Because "DmC Devil May Cry" came with the reboot not the original serie.
4. DMC developers working on Dragon's Dogma?
I read something about that. So wouldn't it make sense to let NT continue making DmC instead of a DMC sequal or prequal?
5. Possible continue collaboration with NT
http://www.vg247.com/2013/01/09/dmc-devil-may-cry-ninja-theory-have-been-amazing-say-capcom/
6. DmC Dante being in Playstation allstar (marketing game), while DMC Dante wasn't a second option (excluded out)
7. DmC itself
DmC reboot is repeating DMC story with different implementation and more focus on story and graphics.
8. DmC character
In beginning DmC Dante smoked and was pretty angry and angsty. Let's ignore his mood. But why did he "quit smoking" if we were to see original Dante again?
I'll tell you: Because if people don't like DmC Dante the serie will go down. And this is a indication of them wanting DmC to replace DMC.
And Dante in DmC is far from a independt character. He's basically a different clone of DMC Dante.
Which is stupid, why do that if its a reboot?
There are probably more statements from Capcom but its hard to find.