Do you think we will see a huge leap in PC games graphics quality once Sony and MS come out with their latest consoles whenver that maybe?
Absolutely.
To answer your question, consoles are not holding back PC graphics, the game makers are. Its all about the money.
PC Gamers more then anything are holding back the industry. I see how many people are PC gamers, what I don't see are sales numbers to back this up. Why do console games outsell PC offerings by close to an order of magnitude on a regular basis? As a publisher, how do you justify a $30 Million budget for a game that may sell 500K units?
The more advanced visual fidelity becomes the larger the percentage of the budget used to create assets. Weak generalized example- DooM cost $1Million to make, $600K on development costs, $200K administrative, $100K promotional $100K assets. Rage- $30Million- $5 Million development, $1.5Million administrative, $8.5Million marketing, $15Million asset development(all numbers completely made up, but the rough guideline is a very real trend).
If your title has a very low ceiling for potential revenue, which every non MMO/casual PC game does right now in relation to budgets, then you can't afford to sink enormous resources into creating the games.
Console titles very frequently sell over 1 Million units, when talking about the HD twins combined they have multiple titles in the 10Million unit range each year- PCs have never been able to touch that(not for a single given year, not even WoW has ever been close to that).
Console gamers cover the asset development, marketing and promotional costs of the games, then PC gamers need only buy enough to offset the cost of developing the port. Yes, PC gamers are 'second class' citizens in the gaming market. That is because they are thoroughly 'second class' in how much money they spend on games.
A lot of people love to talk about the technology and how it relates to this topic. The reality is that this is a business. If you want huge budget AAA games you need money. If PC gamers aren't going to buy them at anywhere close to the pace of their console counterparts then obviously development is going to focus on where the money is.