The phrase "excessive reliance" means depending too much on something or someone, relying on it or them more than is necessary or healthy. Full definition
At the same time, the drawbacks of excessive reliance on state revenue are less widely appreciated. (educationnext.org)
To minimise the anticipated impact of global warming on the ski industry, development of new leisure industries more resistant to or suited to a warmer atmosphere, thus avoiding excessive reliance on the ski industry, e.g., grass - skiing, hiking, residential lodging and eco-tourism, could be helpful in compensating for the income reduction due to snow deterioration (Fukushima et al., 2002). (ipcc.ch)
The blogosphere may be capable of all you attribute to it, but it is a source of a huge amount of misinformation as well, some inadvertent, some deliberate, and I believe it would be wise to acknowledge the dangers of excessive reliance on this means of communication. (judithcurry.com)